golang-github-cloudflare-tableflip-dev 1.2.1~git20200514.4baec98-3 (ppc64el binary) in ubuntu groovy

 It is sometimes useful to update the running code and / or configuration of a
 network service, without disrupting existing connections. Usually, this is
 achieved by starting a new process, somehow transferring clients to it and
 then exiting the old process.
 .
 There are many ways to implement graceful upgrades. They vary wildly in the
 trade-offs they make, and how much control they afford the user. This library
 has the following goals:
  - No old code keeps running after a successful upgrade
  - The new process has a grace period for performing initialisation
  - Crashing during initialisation is OK
  - Only a single upgrade is ever run in parallel